Ellipsograph.



PATENTED APR. 26, 1904.

J. P. HANLON. ELLIPSOGRAPH.

' APPLICATION HLBD MAY s, 189s.

No MODEL.

Patented April 26, 1904.

UNITED STATES .PATENT Ormes.

JOHN F. HANLON, or CONCORD, Nnw HAMPs'insn.

ELLIPSOGIFXAPH.-

SPECIFICATION forming part of I ei'lters Patent No. 758,314, dated April 26, 1904.

l .application iiled May 6, 1898. Serial No. 679,904. (No model.)

To @ZZ whom, it may concern:

Be it known that l, JOHN F. HANLON, a subject of the Queen of Great Britain, residing at Concord, in the county of Merrimack and State of New Hampshire, have invented certainr new and useful Improvements in Ellipsegraph Points and Styluses; and l dohereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and

to figures of reference marked thereon, which form a part of this specification.

'This invention relates to ellipsograph or trammel points and stylus; and it consists in the points and stylus being provided with antifriction pulleys or wheels having grooves A on their circumference to guidea cord or other iiexible material evenly, smoothly, and correctly, thereby giving improved results.

The purpose and object of my invention are to produce ellipsograph vpoints and stylus of improved construction to be used in the cord system of obtaining ellipses (which is not new and is understood) so arranged as tovbe guidedv by the cord in a smooth and accurate path, thereby obtaining unerring results and correctly forming ellipses and other designs or figures.

By means of this device the operator is enabled to describe correctly, easily, and without uncertainty any desired size or proportioned ellipse or oval. Also all sizes of circles and all sizes of arches can be made by the same apparatus.

The drawings herewith presented illustrate in Figure `l a diametrical transverse section of the stylus with marker. Fig. 2 is a diametrical transverse section of one of the ellipsograph-points. Fig. 3 is a diametrical transverse section of a modication of the stylus.

Fig. 4 is a plan view showing the operation of the stylus, the ellipsograph-points as centers and the proper position of the cord thereon, and an ellipse partly drawn. Fig. 5 is a diametrical transverse section of a portion of the stylus, showing the lance-blade. Fig. 6 is a transverse portion of the stylus, showing the split end of spindle N.

l shows the construction of the stylus.,v Y

A represents a'rem'ovable metallicplug inthe upper end .of the stylus andl terminatingin an:

ornamental shape; B, tubing in which a suit-` able markeris placed. The lower end ofthe tubing B is provided with ametallichollow' plug C, from which extends a hollow spindle N, on which vthe grooved wheel D freely rotates, and is held in proper position by the shoulder of plu'gC and washer E. Underneath the washer E is a thread F, on which is screwed the. hollow cap G. The hollow spindle belowthread F is split at right angles, so that when the cap G is screwed on thread F, which is on hollow spindle N, the split spindie pinches on the lead H and firmly holds it in proper adjustment. Ihe lead may be pushed back and a lance-.blade vheldin position by cap G to cut the design after it is described by the marker.

Fig. 2 shows one of the ellipsograph-points, consistingV of a circular metallic head I, into which is rigidly set a metallic pin K at is center. This pin is tapered at its lower end, so as to form a point which can be easily and firmly pressed into any soft material. The grooved wheel D rotates freely on pin Kand is intended to receive a cord (which is used in this system) on its periphery. Beneath the grooved wheel D on pin K is rigidly set a metallic stud J, there being suiiicient space between head' I and stud J toallow the free rotation of the wheel.

Fig. 3 shows the modification of the stylus and consists of a metallic tubing B, open at its upper end, the tubing having an inside diameter large enough to receive an ordinary black lead pencil H or other suitable marker. r[he lower end of the inside of the tubing terminates with the tapered section C' and is intended to prevent thel pencil or marker being pressed down beyond certain limits. The pencil is also held in proper position and adjustment by the friction of the pencil against the inner walls of said tubing. Thelower and outer end of said tubing is reduced down to smaller diameter of the tubing, below grooved IOO Wheel D, is rigidly set a Washer E, intended to keep the wheel in proper position. The smaller diameter or extension of the tubing is provided with an inside diameter 'of just sufficient size to receive the lead portion of the pencil or other marker.

In Fig. 4. is shown the application and operation of the improved ellipsograph points and stylus. When it is desired to describe an ellipse of any size or proportion, the long and short diameters or' the desired ellipse are. marked off on working lines L L at right angles to each other. The exactposition where the ellipsograph-points I I and stylus are to be set is determined by the regular method adopted in this system. The cord is then secured in proper position and placed in the grooved Wheels on the ellipSograph-poin ts I I and stylus B. The stylus is now made to move by hand and is limited and guided by the loop of cord M, thereby producing the desired ellipse. The cord moving easily, smoothly, and evenly by means of the grooves produces correctlyformed figures.

Fig. 5 shows the marker H pushed back and the lance-blade Gr inserted and held in proper position by the split end of spindles N and cap G.

Fig. 6 shows the thread F on the spindle N above the split end of spindle N.

I claim as my invention- 1. An ellipsograph-point consisting of pin K having the head I, and stud J and grooved rotary wheel intermediate between the head and stud, substantially as described.

2. An ellipsograph-stylus carrier consisting of the casing B having the upper plug A and the lower plug C, the latter provided with the threaded hollow spindle N split at the end; the threaded washer E carrying the cap G and engaging the threads of the spindle, and the grooved rotary wheel D above the washer, substantially as described.

3.- The combination of the ellipsographpoints each consisting of the pin K having the head I, stud J and intermediate grooved wheel; the stylus consisting of the casing havving the plug C provided with `the threaded spindle N the end of which is split, the marker therein, the grooved rotary wheel on the spindle-shank, the' interiorly-threaded washer E Yengaging the threaded portionof the spindle` and carryingthe cap Gr, and the cord M engaging the grooved wheels of the stylus and points, substantially as described. y

4. rIhe combination of the stylus, consisting of the casing'B having the upper plug A and lower plug C the latter provided with threadjed hollow lspindle N split at the end and carrying the marker, the interiorly threaded JOHN r. HANLoN.

Witnesses:

WALTER T. EMERSON, EDWARD C. RICHARDSON. 

